Hello kiran potnis
Paulina says:
The SBB Community is a travel support forum run by volunteering travel experts. We are not the customer service and cannot handle such requests.
If at all, see the ticket conditions, the cancellation of international tickets purchased from SBB is only possible by phone (+41 51 225 78 56) or personally at the station.
And, you are probably using the Swiss Travel Pass; the station is Chamonix, France.
Kind regards,
Roland